JPS62241417A - Crystal resonator - Google Patents

Abstract

PURPOSE:To package electronic parts in an electric circuit to high density by using an airtight terminal obtained by sealing lead wires in an annular shell with glass, holding a plate type capacitor in which two capacitors are formed in one body and a crystal element almost in parallel, and pressing a metallic cap onto the airtight terminal. CONSTITUTION:The capacitor 30 is held on the airtight terminal 19 and then the almost rectangular crystal element 1 which has exciting electrodes 2 and 2' and lead-out electrodes 3 and 3' formed on the top and reverse surfaces opposite each other and the almost rectangular crystal element 1 are held on inner leads 7 and 7' by using a conductive adhesive or solder materials 5 and 5' almost in parallel to the capacitor 30. Then while the crystal element 1 is oscillated through lead wires 10, 10', and 11, metal is stuck on the exciting electrode 2 by vapor deposition, etc., to adjust the oscillation frequency to a specific value. Lastly, the metallic cap 14 is pressed onto the airtight terminal 19 to seal the capacitor 30 and crystal element 1 airtightly. Thus, the capacitor is incorporated to save its space, so the electronic parts can be packaged to high density.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a crystal resonator used in crystal oscillation circuits of various electronic devices.

BACKGROUND OF THE INVENTION The configuration of a conventional oscillation circuit using a crystal resonator includes a crystal resonator 22 and a capacitor 2, as shown in FIG.
3, a resistor 2o, an inverter 21, and other components are individually arranged on the circuit board. Figure 1-6 (&), (
b) is a front sectional view and a side sectional view showing an example of a conventional crystal resonator, in which lead wires 18, 18 are attached to an annular shell 13.
A crystal element 1 having excitation electrodes 2.2' and extraction electrodes 3.3' formed opposite to each other on the front and back is attached to an airtight terminal sealed with a glass 12 using conductive adhesive or solder 17. ' to hold the extraction electrode 3
．． 3' and the inner leads 16, 16' are electrically connected, a metal cap 14 is press-fitted and hermetically sealed.

Problems to be Solved by the Invention However, the above-described configuration poses a considerable obstacle to high-density packaging of electronic components in recent electronic circuits.

Means for Solving the Problems In order to solve the above problems, the present invention uses an airtight terminal in which a lead wire is inserted into an annular shell and the lead wire is sealed in glass to the shell, and two terminals are provided. A plate-shaped capacitor integrally formed with a crystal element and a crystal element are held substantially parallel to each other, and a metal cap for hermetically sealing the capacitor and the crystal element is press-fitted into the airtight terminal. be.

Effects of the present invention With the above-described configuration, the capacitive element of the oscillation circuit, that is, the capacitor, which was conventionally placed outside the crystal resonator, can be easily incorporated, so that the space for the capacitive element can be saved. High-density packaging of electronic components can be achieved. In addition, the number of parts for the user is reduced,
This also contributes to improving the reliability of the circuit. Furthermore, in the past, it was necessary to fine-tune the oscillation frequency using a variable capacitor after mounting on a printed circuit board.
When the crystal resonator of the present invention is used, frequency accuracy is improved, such as by eliminating the need for the above-mentioned adjustment process.

Examples Examples of the present invention will be described below with reference to the drawings. FIGS. 2(&), (b), and (0) are a plan view, a front cross-sectional view, and a side cross-sectional view showing an embodiment of the airtight terminal used in the crystal resonator of the present invention. Insert the wires 10, 10', 11 into the shell 13
The glass portion 12 is shown in a sealed state. Figures 3 (IL), (b), and (C) are a plan view, a front view, a bottom view, and a side view showing one embodiment of a capacitor used in a crystal resonator of the present invention. Dielectric substrate 31
Two electrodes 32°32' are formed on one main surface of the board, and one electrode 33 is formed on the other main surface, and two capacitors are mounted on one substrate.
It shows a state in which it is individually formed. Figure 4 (IL), (
b) and (0) are a plan view, a front view, and a side view showing the state in which the capacitor 30 is held on the airtight terminal 19, and the electrodes 32° 32', 33 of the capacitor are connected to the inner lead 7.7'. , 9 with conductive adhesive or solder 4.
4' and 6 are respectively mechanically held and electrically connected. Figure 1 (IL), (b).

1(b) is a plan view, a front sectional view, and a side sectional view showing one embodiment of the crystal resonator of the present invention, and FIGS. 4(a) to (0)
) As shown in FIG.
A substantially rectangular crystal element 1 having lead electrodes 3, 3' and an inner lead 7.7' is held substantially parallel to the capacitor 30 using conductive adhesive or solder 6.6'. , are electrically connected to the lead-out electrode 16 and the lead-out electrode 3', respectively. Note that the lead-out electrode 16 is electrically connected to the lead-out electrode 3. The crystal element 1 and the capacitor 30 may be held by holding the crystal element 1 first and then holding the capacitor 3o.
It may be held in circulation. Next, lead wire 10°10',
While causing the crystal element 1 to oscillate through the crystal element 11, metal is deposited on the excitation electrode 2 by vapor deposition or the like, and the oscillation frequency is adjusted to a predetermined value. At this time, in order to adjust the oscillation frequency in a way that absorbs variations in the capacitance of the capacitor 30,
The frequency accuracy is improved compared to the conventional method. Finally, the metal cap 14 is press-fitted into the hermetic terminal 19 to hermetically seal the capacitor 30 and the crystal element 1.

Through the above steps, a crystal resonator 16 having a built-in capacitor 30 as shown in the wiring diagram shown in FIG. 6 with improved frequency accuracy is formed.

6(IL), (b), and (C) are a plan view and a front cross-sectional view showing another embodiment of the airtight terminal used in the crystal resonator of the present invention, in which three lead wires 41, 42. 43 are arranged on a line. Figure 7 (2L).

(b) and (0) are a plan view, a front sectional view, and a side sectional view showing other embodiments of the crystal resonator of the present invention, in which the airtight terminal 40 described above is used. Similar to the embodiment shown in FIG. 1, the capacitor 3Q and the crystal element 1 are held substantially parallel, and the electrode 33 of the capacitor 3° is electrically connected to the center lead wire 42.

Each of (a), (b), (C
1 is a plan view, a front sectional view, and a side sectional view showing other embodiments of the airtight terminal used in the crystal resonator of the present invention, in which a lead-shaped holding part 46 is shown in order to hold the crystal element and the capacitor. It was formed. As a forming method, there are a method of welding or soldering a substantially E-shaped member to the inner lead, or a method of molding it integrally with the lead wire using a press or the like.

Each of (&), (b), (c) in Figures 9 and 11
) are a plan view, a front sectional view, and a side sectional view showing other embodiments of the crystal resonator of the present invention, and the embodiment shown in FIG.
The embodiment shown in FIG. 11 uses the airtight terminal 6o shown in FIG. 8, and the embodiment shown in FIG. 10 uses the airtight terminal 60 shown in FIG.

The wiring diagrams of the embodiments of the crystal resonator of the present invention shown in FIGS. 7, 9, and 11 are similar to FIG. 6.

In the above description, the crystal element used in the crystal resonator of the present invention has been described as having a substantially rectangular flat plate shape, but the crystal element is not limited to this shape. Figure 12 (
IL), (b), and (0) are a plan view, a front view, and a side view showing other embodiments of the crystal element used in the crystal resonator of the present invention. A chamfered portion 70 is formed at the end. Figure 13 (IL
), (b), and (C) are plan views showing other embodiments of the crystal element used in the crystal resonator of the present invention.

The front view and the side view show R processing.

14(&), (b), and (C) are a plan view, a front view, and a side view showing another embodiment of a crystal element used in the crystal resonator of the present invention, which is shaped like a tuning fork.

The crystal resonator 1 of the present invention described above has achieved sufficient performance in terms of impact resistance, but in order to further strengthen the impact resistance, the longitudinal ends of the crystal element 1 and the capacitor 30 are It may be fixed to the glass part of the airtight terminal with an insulating adhesive. Further, the longitudinal ends of the crystal element 1 and the capacitor 3o may be fixed to the glass portion of the airtight terminal and the substantially E-shaped holding portion using an insulating adhesive.

Further, the crystal resonator of the present invention may be one in which the frequency-temperature characteristics of the crystal element 1 are improved by utilizing the temperature characteristics of the capacitance of the capacitor 30.

In the above description, the case where the capacitor 30 has a substantially rectangular shape has been described, but the capacitor used in the crystal shaker of the present invention is not limited to the above shape, and any shape can be applied. Moreover, any shape can be applied to the crystal element.

Effects of the Invention As explained above, with the crystal resonator of the present invention, the capacitive element of the oscillation circuit, that is, the capacitor, which was conventionally placed outside the crystal resonator, can be easily incorporated. This saves space for elements and enables high-density mounting of electronic components. Furthermore, the number of parts for the user is reduced, contributing to improved reliability as a circuit. Furthermore, conventionally, after mounting on a printed circuit board,
Although a step of finely adjusting the oscillation frequency using a variable capacitor was required, the use of the crystal resonator of the present invention eliminates the need for the above adjustment step, and has great industrial value.

[Brief explanation of drawings]

FIGS. 1(IL), (b), and (C) are a plan view, a front sectional view, and a side sectional view showing one embodiment of the crystal resonator of the present invention, and FIG. 2(IL), (b), and ( Ct) is a plan view, a front sectional view, a side sectional view, and FIG. 3 (IL) showing an embodiment of the air/can terminal used in the crystal resonator of the present invention.
t(b), (C), and (d) are a plan view, a front view, a bottom view, and a side view showing one embodiment of a capacitor used in a crystal resonator of the present invention, and FIG. 4(a). (b) and (C) are a plan view, a front cross-sectional view, and a side cross-sectional view showing a state in which a capacitor is held in an airtight terminal; FIG. 6 is a wiring diagram of the crystal resonator of the present invention; FIG. 6 (&); (b) is a plan view and a front sectional view showing another embodiment of the airtight terminal used in the crystal resonator of the present invention, and each (&) in FIGS. 8 and 10.
, (b) and (0) are a plan view, a front sectional view, a side sectional view, and FIGS. 7, 9, and 11 showing other embodiments of the airtight terminal used in the crystal resonator of the present invention, respectively. Each (I
L), (b), and (0) are a plan view, a front sectional view, and a side sectional view showing other embodiments of the crystal resonator of the present invention, and each of FIGS. 12, 13, and 14 ( IL),
(b). (Cl is a plan view, a front view, and a side view showing each other embodiment of the crystal element used in the crystal resonator of the present invention, and FIG. 16 (
ILI, (b) is a front sectional view and a side sectional view showing an example of a conventional crystal resonator, and FIG. 16 is a wiring diagram showing an example of the configuration of a conventional oscillation circuit. 1...Crystal element, 10.10', 11...
...Lead wire, 12...Glass part, 13...Curved shell, 14...Cap, 16...
Crystal oscillator, 19... curved airtight terminal, 30... capacitor. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Mizukyo Qinzi 13- Siese Fig. 2 Fig. 3 J/ 1s4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 (α) Ro: Co 1 (b) (+: 1

Claims (8)

[Claims] (1) A lead wire is inserted into an annular shell, and an airtight terminal is used in which the lead wire is sealed in glass to the shell, and a plate-shaped capacitor, which is formed by integrally forming two capacitors, and a crystal element are connected approximately parallel to each other. At the same time as holding the airtight terminal above,
A crystal resonator characterized in that a metal cap is press-fitted to hermetically seal the capacitor and the crystal element. (2) The crystal resonator according to claim 1, wherein the lead wires of the airtight terminals are arranged in a line. (3) Forming a substantially E-shaped holding part at the tip of the lead wire,
The crystal resonator according to claim 1, wherein the crystal element and the capacitor are held in the holding portion. (4) The crystal element is approximately rectangular and is chamfered or
The crystal resonator according to claim 1, wherein the crystal resonator is rounded. (5) The crystal resonator according to claim 1, wherein the crystal element has a tuning fork shape. (6) The crystal resonator according to claim 1, wherein the longitudinal ends of the crystal element and the capacitor are fixed to the glass portion of the airtight terminal with an insulating adhesive. (7) Glue the longitudinal ends of the crystal element and the capacitor with insulating adhesive to the glass part of the airtight terminal and the approximately E
The crystal resonator according to claim 1, wherein the crystal resonator is fixed to a letter-shaped holding portion. (8) The crystal resonator according to claim 1, wherein the frequency-temperature characteristics of the crystal element are improved by utilizing the temperature characteristics of the capacitance of the capacitor.